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<?php /** * Class MonitorCssTransientCaching. * * @package AmpProject\AmpWP / namespace AmpProject\AmpWP\BackgroundTask; use AMP_Options_Manager; use AmpProject\AmpWP\Option; use DateTimeImmutable; use DateTimeInterface; use Exception; /* * Monitor the CSS transient caching to detect and remedy issues. * * This checks whether there's excessive cycling of CSS cached stylesheets and disables transient caching if so. * * @package AmpProject\AmpWP * @since 2.0 * @internal / final class MonitorCssTransientCaching extends CronBasedBackgroundTask { /* * Name of the event to schedule. * * @var string / const EVENT_NAME = 'amp_monitor_css_transient_caching'; /* * Key to use to persist the time series in the WordPress options table. * * @var string / const TIME_SERIES_OPTION_KEY = 'amp_css_transient_monitor_time_series'; /* * Default threshold to use for problem detection in number of transients per day. * * This is set high to avoid false positives and only trigger on high-traffic sites that exhibit serious problems. * * @var float / const DEFAULT_THRESHOLD = 5000.0; /* * Sampling range in days to calculate the moving average from. * * @var int / const DEFAULT_SAMPLING_RANGE = 14; /* * Register the service with the system. * * @return void / public function register() { add_action( 'amp_plugin_update', [ $this, 'handle_plugin_update' ] ); parent::register(); } /* * Get the interval to use for the event. * * @return string An existing interval name. Valid values are 'hourly', 'twicedaily' or 'daily'. / protected function get_interval() { return self::DEFAULT_INTERVAL_DAILY; } /* * Get the event name. * * This is the "slug" of the event, not the display name. * * Note: the event name should be prefixed to prevent naming collisions. * * @return string Name of the event. / protected function get_event_name() { return self::EVENT_NAME; } /* * Process a single cron tick. * * @todo This has arbitrary arguments to allow for testing, as we don't have dependency injection for services. * With dependency injection, we could for example inject a Clock object and mock it for testing. * * @param DateTimeInterface\|string $date Optional. Date to use for timestamping the processing (for testing). An empty string is provided during cron. * @param int\|string $transient_count Optional. Count of transients to use for the processing (for testing). An empty string is provided during cron. * @return void * @throws Exception If a date could not be instantiated. / public function process( $date = '', $transient_count = '' ) { if ( wp_using_ext_object_cache() \|\| $this->is_css_transient_caching_disabled() ) { return; } if ( ! $date instanceof DateTimeInterface ) { $date = new DateTimeImmutable(); } if ( ! is_int( $transient_count ) ) { $transient_count = $this->query_css_transient_count(); } $date_string = $date->format( 'Ymd' ); $time_series = $this->get_time_series(); $time_series[ $date_string ] = $transient_count; ksort( $time_series ); $sampling_range = $this->get_sampling_range(); $time_series = array_slice( $time_series, - $sampling_range, null, true ); $this->persist_time_series( $time_series ); $moving_average = $this->calculate_average( $time_series ); if ( $moving_average > 0.0 && $moving_average > (float) $this->get_threshold() ) { $this->disable_css_transient_caching(); } } /* * Check whether transient caching of stylesheets is disabled. * * @return bool Whether transient caching of stylesheets is disabled. / private function is_css_transient_caching_disabled() { return AMP_Options_Manager::get_option( Option::DISABLE_CSS_TRANSIENT_CACHING, false ); } /* * Disable transient caching of stylesheets. / private function disable_css_transient_caching() { AMP_Options_Manager::update_option( Option::DISABLE_CSS_TRANSIENT_CACHING, true ); } /* * Query the number of transients containing cache stylesheets. * * @return int Count of transients caching stylesheets. / public function query_css_transient_count() { global $wpdb; return (int) $wpdb->get_var( "SELECT COUNT() FROM {$wpdb->options} WHERE option_name LIKE '_transient_amp-parsed-stylesheet%'" ); } /** * Handle update to plugin. * * @param string $old_version Old version. / public function handle_plugin_update( $old_version ) { // Reset the disabling of the CSS caching subsystem when updating from versions 1.5.0 or 1.5.1. if ( version_compare( $old_version, '1.5.0', '>=' ) && version_compare( $old_version, '1.5.2', '<' ) ) { AMP_Options_Manager::update_option( Option::DISABLE_CSS_TRANSIENT_CACHING, false ); } } /* * Get the time series stored in the WordPress options table. * * @return int[] Time series with the count of transients per day. / public function get_time_series() { return (array) get_option( self::TIME_SERIES_OPTION_KEY, [] ); } /* * Get the default threshold to use. * * @return float Default threshold to use. / public function get_default_threshold() { return self::DEFAULT_THRESHOLD; } /* * Get the default sampling range to use. * * @return int Default sampling range to use. / public function get_default_sampling_range() { return self::DEFAULT_SAMPLING_RANGE; } /* * Persist the time series in the database. * * @param int[] $time_series Associative array of integers with the key being a date string and the value the count * of transients. / private function persist_time_series( $time_series ) { update_option( self::TIME_SERIES_OPTION_KEY, $time_series, false ); } /* * Calculate the average for the provided time series. * * Note: The single highest value is discarded to calculate the average, so as to avoid a single outlier causing the * threshold to be reached. * * @param int[] $time_series Associative array of integers with the key being a date string and the value the count * of transients. * @return float Average value for the provided time series. / private function calculate_average( $time_series ) { $sum = array_sum( $time_series ); $sum_without_outlier = $sum - max( $time_series ); $count_without_outlier = count( $time_series ) - 1; if ( $count_without_outlier <= 0 ) { return 0.0; } return $sum_without_outlier / $count_without_outlier; } /* * Get the threshold to check the moving average against. * * This can be filtered via the 'amp_css_transient_monitoring_threshold' filter. * * @return float Threshold to use. / private function get_threshold() { /* * Filters the threshold to use for disabling transient caching of stylesheets. * * @since 1.5.0 * * @param int $threshold Maximum average number of transients per day. / $threshold = (float) apply_filters( 'amp_css_transient_monitoring_threshold', self::DEFAULT_THRESHOLD ); return $threshold > 0.0 ? $threshold : self::DEFAULT_THRESHOLD; } /* * Get the sampling range to limit the time series to for calculating the moving average. * * This can be filtered via the 'amp_css_transient_monitoring_sampling_range' filter. * * @return int Sampling range to use. / private function get_sampling_range() { /* * Filters the sampling range to use for monitoring the transient caching of stylesheets. * * @since 1.5.0 * * @param int $sampling_rage Sampling range in number of days. */ $sampling_range = (int) apply_filters( 'amp_css_transient_monitoring_sampling_range', self::DEFAULT_SAMPLING_RANGE ); return $sampling_range > 0 ? $sampling_range : self::DEFAULT_SAMPLING_RANGE; } }

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